Goodwill and Other Intangibles (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the Carrying Amount of Goodwill

Changes in the carrying amount of goodwill are as follows:

September 30,
(In millions)	2017		2016
Balance as of January 1, as reported	$	8,369	$	7,889
Goodwill acquired	533		74
Other adjustments(a)	198		12
Balance at September 30,	$	9,100	$	7,975

Amortized Intangible Assets

The gross cost and accumulated amortization at September 30, 2017 and December 31, 2016 are as follows:

	September 30, 2017						December 31, 2016
(In millions)	Gross Cost		Accumulated Amortization		Net Carrying Amount		Gross Cost		Accumulated Amortization		Net Carrying Amount
Client Relationships	$	1,679	$	487	$	1,192	$	1,390	$	392	$	998
Other (a)	231		103		128		204		76		128
Amortized intangibles	$	1,910	$	590	$	1,320	$	1,594	$	468	$	1,126

^(a) Primarily non-compete agreements, trade names and developed technology.

Estimated Future Aggregate Amortization Expense

The estimated future aggregate amortization expense is as follows:

For the Years Ending December 31,
(In millions)	Estimated Expense
2017 (excludes amortization through September 30, 2017)	$	50
2018	176
2019	166
2020	145
2021	135
Subsequent years	648
	$	1,320